Merge tag 'iwlwifi-next-for-kalle-2014-12-30' of https://git.kernel.org/pub/scm/linux...

[cascardo/linux.git] / arch / powerpc / include / asm / pgtable-ppc64.h

diff --git a/arch/powerpc/include/asm/pgtable-ppc64.h b/arch/powerpc/include/asm/pgtable-ppc64.h
index 9b4b190..b9dcc93 100644 (file)
--- a/arch/powerpc/include/asm/pgtable-ppc64.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64.h
@@ -152,7 +152,7 @@
 #define pmd_none(pmd)          (!pmd_val(pmd))
 #define        pmd_bad(pmd)            (!is_kernel_addr(pmd_val(pmd)) \
                                 || (pmd_val(pmd) & PMD_BAD_BITS))
-#define        pmd_present(pmd)        (pmd_val(pmd) != 0)
+#define        pmd_present(pmd)        (!pmd_none(pmd))
 #define        pmd_clear(pmdp)         (pmd_val(*(pmdp)) = 0)
 #define pmd_page_vaddr(pmd)    (pmd_val(pmd) & ~PMD_MASKED_BITS)
 extern struct page *pmd_page(pmd_t pmd);
@@ -164,9 +164,21 @@ extern struct page *pmd_page(pmd_t pmd);
 #define pud_present(pud)       (pud_val(pud) != 0)
 #define pud_clear(pudp)                (pud_val(*(pudp)) = 0)
 #define pud_page_vaddr(pud)    (pud_val(pud) & ~PUD_MASKED_BITS)
-#define pud_page(pud)          virt_to_page(pud_page_vaddr(pud))
 
+extern struct page *pud_page(pud_t pud);
+
+static inline pte_t pud_pte(pud_t pud)
+{
+       return __pte(pud_val(pud));
+}
+
+static inline pud_t pte_pud(pte_t pte)
+{
+       return __pud(pte_val(pte));
+}
+#define pud_write(pud)         pte_write(pud_pte(pud))
 #define pgd_set(pgdp, pudp)    ({pgd_val(*(pgdp)) = (unsigned long)(pudp);})
+#define pgd_write(pgd)         pte_write(pgd_pte(pgd))
 
 /*
  * Find an entry in a page-table-directory.  We combine the address region
@@ -422,7 +434,22 @@ extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
                       pmd_t *pmdp, pmd_t pmd);
 extern void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
                                 pmd_t *pmd);
-
+/*
+ *
+ * For core kernel code by design pmd_trans_huge is never run on any hugetlbfs
+ * page. The hugetlbfs page table walking and mangling paths are totally
+ * separated form the core VM paths and they're differentiated by
+ *  VM_HUGETLB being set on vm_flags well before any pmd_trans_huge could run.
+ *
+ * pmd_trans_huge() is defined as false at build time if
+ * CONFIG_TRANSPARENT_HUGEPAGE=n to optimize away code blocks at build
+ * time in such case.
+ *
+ * For ppc64 we need to differntiate from explicit hugepages from THP, because
+ * for THP we also track the subpage details at the pmd level. We don't do
+ * that for explicit huge pages.
+ *
+ */
 static inline int pmd_trans_huge(pmd_t pmd)
 {
        /*
@@ -431,16 +458,6 @@ static inline int pmd_trans_huge(pmd_t pmd)
        return (pmd_val(pmd) & 0x3) && (pmd_val(pmd) & _PAGE_THP_HUGE);
 }
 
-static inline int pmd_large(pmd_t pmd)
-{
-       /*
-        * leaf pte for huge page, bottom two bits != 00
-        */
-       if (pmd_trans_huge(pmd))
-               return pmd_val(pmd) & _PAGE_PRESENT;
-       return 0;
-}
-
 static inline int pmd_trans_splitting(pmd_t pmd)
 {
        if (pmd_trans_huge(pmd))
@@ -451,6 +468,14 @@ static inline int pmd_trans_splitting(pmd_t pmd)
 extern int has_transparent_hugepage(void);
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
+static inline int pmd_large(pmd_t pmd)
+{
+       /*
+        * leaf pte for huge page, bottom two bits != 00
+        */
+       return ((pmd_val(pmd) & 0x3) != 0x0);
+}
+
 static inline pte_t pmd_pte(pmd_t pmd)
 {
        return __pte(pmd_val(pmd));
@@ -576,6 +601,5 @@ static inline int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
         */
        return true;
 }
-
 #endif /* __ASSEMBLY__ */
 #endif /* _ASM_POWERPC_PGTABLE_PPC64_H_ */